This paper gives an overview of a research, which is focused on the development convenient device for continuous non-invasive monitoring arterial blood pressure. The pressure estimation method based presumption that there singular relationship between pulse wave propagation time in system and parameter used this study transit (PWTT). measurement PWTT involves registration two markers, one ECG R peak detection another peripheral arteries. reliability beat to systolic calculation during...

The aim of this study was to evaluate the effect modulated microwave exposure on human EEG individual subjects. experiments were carried out four different groups healthy volunteers. 450 MHz radiation at 7 Hz (first group, 19 subjects), 14 and 21 (second 13 40 70 (third 15 217 1000 (fourth subjects) frequencies applied. field power density scalp 0.16 mW/cm(2). calculated spatial peak SAR averaged over 1 g 0.303 W/kg. Ten cycles (1 min off on) fixed modulation All subjects completed...

Abstract This study is aimed at evaluating the effect of microwave radiation on human brain bioelectric activity different levels exposure. For this purpose, 450 MHz exposure modulated 40 Hz frequency was applied to a group 15 healthy volunteers two specific absorption rate (SAR) levels: higher level 0.303 W/kg (field strength 24.5 V/m) and lower 0.003 2.45 V/m). Ten cycles (1 min off 1 on) fixed SAR values were applied. A resting eyes‐closed electroencephalogram (EEG) continuously recorded....

Current work is a part of long term research, which aim to study the possibilities diagnose atherosclerosis in early stadium by using pulse wave velocity and its waveform analysis. The mobile experimental measurement complex built technically tested for hospital. Measurement consists ten physiological signal recording channels reference devices: Sphygmocor, Arteriograph, Finapres. measurements with this are planned carry out during six month on patients different severity coronary disease diabetes.

The aim of this study was to propose an improved method for accurate dialysis dose evaluation and extrapolation by means Kt/ <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</i> from online UV-absorbance measurements real time continuous treatment monitoring. included a total 24 treatments ten uremic patients, seven whom were male three females. All patients on chronic thrice-weekly hemodialysis therapy. both stable unstable treatments. A known...

The aim of this study was to develop an optimized physical activity classifier for real-time wearable systems with the focus on reducing requirements device power consumption and memory buffer. Classification parameters evaluated in were sampling frequency acceleration signal, window length classification fragment, number features, found different feature selection methods. For parameter evaluation, a decision tree created based signals recorded during tests, where 25 healthy test subjects...

Information transmission and processing in the nervous system has stochastic nature. Multiple factors contribute to neuronal trial-to-trial variability. Noise variations are introduced by processes at molecular cellular level (thermal noise, channel current membrane potential variations, biochemical diffusion noise synapses etc). The affected different physical (temperature, electromagnetic field) chemical (drugs) factors. aim of this study was experimental investigation hypotheses that...

This paper gives an overview of a research, which is focused on the development convenient method for continuous non-invasive monitoring arterial blood pressure (BP).The based presumption that there single relationship between pulse wave propagation time in system and BP.The transit (PWTT) measurement involves registration two markers, one usually ECG another detection peripheral arteries.This study makes comparative evaluation four different methods detection: 1) self-mixing diode laser,...

The aim of this study was to evaluate how the physical activity classification window length, accelerometer sampling frequency and number correlating features affect classifier performance. It is important effect these elements in order reduce computational power memory buffers needed for wearable systems, where done real-time. Three different lengths (5 s, 3 1s), frequencies (50 Hz, 25 13 Hz) two feature sets (110 43 features) were tested evaluated study. As a result, it found that...

The aim of the study was to determine whether different sleep stages, especially REM sleep, affect QT interval duration and variability in male patients without obstructive apnea (OSA). Polysomnographic recordings 30 were analyzed. Beat-to-beat calculated using QTV index (QTVI) formula. For QTc calculation, addition Bazett’s formula, linear parabolic heart rate correction formulas with two separate α values used. QTVI as means 2 awake, 3 NREM, episodes; each episode 300 sec. Mean not...

In order to improve the planning decisions of urban environment and consider well-being residents, an objective assessment mental stress in is needed. The aim this study was investigate changes photoplethysmographic (PPG) second derivative PPG (SDPPG) signal parameters related arterial stiffness during assessment. carried out on 15 female 13 male subjects between age 25 60 years. finger recorded with a transmission mode sensor subject's inactive state, followed by arithmetic test. signals...

Human activity measurement and classification has been hot research topic for several years. Most of the solutions are based on mobile phones, however there also some wearable device implementations that have very specific functionality. The aim this paper is to propose a human recognition fall detection solution provides extra safety people working in challenging conditions. system integrated with monitoring real-time information about all workers raises automatically an alarm case...

The arterial pulse waveform dependence on applied pressure was experimentally analyzed. An experimental device built and tests were conducted. Pressure to the brachial artery analysed photoplethysmographic registered from radial artery. signal analyzed by calculating differences between waveforms. In addition amplitude slope of rising front studied. When lowered level where piezoelectric is near its maximum, waveforms decrease. It concluded that there a critical below this no longer influenced.

The aim of the study was to apply different novel ventricular repolarization assessment models clinical 24-hour ECG recordings for identification patients with high level myocardial electrical instability (MEI), i.e. those significantly predisposed development potentially life-threatening cardiac arrhythmias. In order explore inhomogeneity, Holter forty patients, divided into 4 groups according their maximal Lown grade (Lown 0, 3A, 4A, 4B), were studied using six QT/RR regression and heart...

The aim of this paper is to propose a smart optical sensor for cardiovascular activity monitoring at different tissue layers. Photoplethysmography (PPG) noninvasive technique mainly blood volume changes in the examined tissue. However, important physiological parameters, such as oxygen saturation, heart and breathing rate, dynamics skin micro-circulation, vasomotion etc., can be extracted from registered PPG signal. developed consists 32 light emitting sources with four wavelengths, which...